Our company also does mail-orders and phone-orders, so we often impersonate customers.
From an administrative standpoint, it would be most helpful if admins were able to filter all orders which were impersonated, and a sub-filter to select the customer (all in administrator role).
So, for example, if I select the checkbox option to "Only Show Impersonated Orders"
A drop-down appears with "ALL Admins" pre-selected, and each administrator name in the drop-down list the admin can choose.
This way we can create and export a list of only the orders that each admin has impersonated.